Fort Worth daily gazette. (Fort Worth, Tex.) 1882-1891, 1887-10-02
POPULAR SCIENCE.
Nores OF Invention and Discovery from the
World Ovcr,

World Oycr.
Wrought iron expands ard contracts
with force OF about 200 pounds par
square inch for every degree Fahrenheit.
Some Psychologists think that the fire.
-, qdent washing sHd shsmDCoiDg Of TIE
hnir are more conducive to badness than
Is the ci0se-ith2g, alright hat.
The common thistle which now covers
vast sores IN South America was intro
daccd by 50 Englisaman, who sowed It
believing it would prove valuable for tod
! DIR.
TIE two Oldest trees III the world are
! supposed % be the one III C1lavc~rs
county, CsI., that is supposed to Be 500
| years 0!d, and Tic cypress of S0n12, il
| I4om5a7dy, I.lly, thar is 1911 years Old.
or planted IcTty-lUO year6 3. G..
| When you have to repair your boiler
furnace, says tire Stationary EaGinaer,
&hd cannot get suy Hre-clay, take com
mon earth mixed with Ccter il which
| you have dissolved Ijtlle rock Ct other
salt use same as fTe-Clay-the furnace
VII last fully IS Iong.
Steam occupies I128 times as much
spice IS water; that IS. one cuJiC inCh OF
water will make l52S cubic inches o.
sEaam at atmospheric pressure. It may.
I<lowe7er, De compressed into & erace OF
three cubic inches, and Will tSen have the
pressure Of 1910 pounds 70 the square
iuch.
1t is stated that sound a. excellent
brass castings will result il, powdered
glass be stirred into melted brass Wlau
in the crucibles. The glass hux collects
all impurities which rise ID the top aad
can be skinned of, impurities which
otherwise would be poured into the
mould with the metal
An English Inventor PROPOSES to i'm
prove, by condensation and hardening,
the barrels Of small &rms, tubes, etc. in
their tinished state; this to be accom-
plissed By subJeCtin& them to pressure
OF SEQ or more tons while Jhe7 are I'M.
merred in water in O strong vessel, the
operation being performed by hydraulic
pressure caused by q heavy hammer fall
lag on piston which closes said vessel.
- Though electrical storage batteries
have attracted attention only Wi.hiQ the
pas; seven years, the discover 9g the
principle IS as oh IS Tie century, Gauth-
eC0t having fest noticed in 1901 rha7 D}st-
mum ot silver wires gave off r current
after having disc0EreCted ErCm voItaiC
battery with Which they had been used
for cecomp0siHg saline Tater. TIE dtst
secondary cell Of FlzGte was made ir
1860.
Cotton according to scientific author
! ity, IS not foeT, but plant hair. +
, holds 10 ca spun into threaC beCguse Of
peculiar twists in eGcd hair, shown uu-
| DER the microscope, especially in polar
! Izec light. Linen thread may be spun,
! because tine fax foers have certain rouea-
! nesses on their surfaces, which enacle
| them to cling together. Hence, il is in
possible to make IS fine linen &s cotton
| cloth, but it is much stronger.
Mr. Edison, in his "pyromsgnehc gen
eratOr OF electricity" believes himqeIi 60
BE able 10 get electric power directly
from tn2 coal with au economy eQEal 10
snd probsoly greatly exceeding inst #
the IGeiraC5 m5;hod OF ordinary dyuamos.
HIS Gppar2tus Is based 0l the principle
that the magnetic metals-irGD, niCke.
and cobs't-lo>e their mGgn6tizabIIitq
when moderately heated, the haati1g end
cooling Of these G:2.sls IN g magnetic fsld
causing variations il taeir megCett3m
which produce an electric current in 4
| Surrounding coil OF wire.
The Few French incombussibla Ice is
quite novelty, and the composition hy
which this result IS achieved IS eqaaliy
ad1p.edI II seems, 70 rendg1i1g wool sat
| psper u1iEf2mma1ie L IS mixture OF
| 50 parts OK pare sulphsfa u ammonia, %
/ parIs Carbonate If ammonia, 80 parts
! ocrAcIc ACID, II paris pu15 borex, 90 oarts
starcn and 1000 parts distilled OF per-
water. 5lese ingredients are most
| thoroughly combined, JAa materials cre
| dipped IN tais a1iuSca yghile not, 50 $
~ &c completely inpiegnsted, e:ser
! which yAeE ere dried GuG iIlaea a5 c.Gtg-
AIRY ssSEea tzDrics.
DR.. =. Mitchell Pru6jen Ct Eew Eoyz.
! has hoe2 pl.EiDg important exDer!meD. j.
wish Wv % 6tterGiaa the ii cs u
freezing on bacteria n the case OF the
C&cillUs psodisi0su5 there we're $500
hac>eri2 in & cubic caaalmeter of water
before freezing; after being frozen four
dtys 2910, s?Eer thirty seven dayg twenty
tUo, and none alter fity-one days. Oh
pyogenas aure23 there
were countless number before freezing,
s?ser eighteen dsys Of freezing 224. sos,
after fity-f0ur days, 81 324, and after
sixtysiz days 29,28O. OF the typhoid
fayer bacilus, innumersble before Eraaz-
lag, 1,0i9 ,409 after being Trojan eleven
days, 336,457 after t,genty seven DAYS,
S9.196 after torty-twc days, and 7S4s af